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net: make socket read/write_iter() honor IOCB_NOWAIT

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[ Upstream commit ebfcd8955c ]

The socket read/write helpers only look at the file O_NONBLOCK. not
the iocb IOCB_NOWAIT flag. This breaks users like preadv2/pwritev2
and io_uring that rely on not having the file itself marked nonblocking,
but rather the iocb itself.

Cc: netdev@vger.kernel.org
Acked-by: David Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jens Axboe
2019-12-09 20:58:56 -07:00
committed by Greg Kroah-Hartman
parent 9d5b54cfe0
commit b280f0ea1c
1 changed files with 2 additions and 2 deletions
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4
net/socket.c
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@@ -867,7 +867,7 @@ static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
.msg_iocb = iocb};
ssize_t res;
if (file->f_flags & O_NONBLOCK)
if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
msg.msg_flags = MSG_DONTWAIT;
if (iocb->ki_pos != 0)
@@ -892,7 +892,7 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (iocb->ki_pos != 0)
return -ESPIPE;
if (file->f_flags & O_NONBLOCK)
if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
msg.msg_flags = MSG_DONTWAIT;
if (sock->type == SOCK_SEQPACKET)